18954223237 has 4 divisors (see below), whose sum is σ = 19098912096. Its totient is φ = 18809534380.

The previous prime is 18954223201. The next prime is 18954223259. The reversal of 18954223237 is 73232245981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18954223237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18954223637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72344233 + ... + 72344494.

It is an arithmetic number, because the mean of its divisors is an integer number (4774728024).

Almost surely, 2^18954223237 is an apocalyptic number.

It is an amenable number.

18954223237 is a deficient number, since it is larger than the sum of its proper divisors (144688859).

18954223237 is a wasteful number, since it uses less digits than its factorization.

18954223237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144688858.

The product of its digits is 725760, while the sum is 46.

The spelling of 18954223237 in words is "eighteen billion, nine hundred fifty-four million, two hundred twenty-three thousand, two hundred thirty-seven".